Materials Literature
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Multiferroic bilayers composed of a magnetite (Fe3O4) and a BaTiO3 layer show nonlinear current-voltage characteristics in current perpendicular to plane configuration. The magnetoresistance of the bilayers is strongly bias dependent and can be switched from negative at low bias to positive at large bias. It is shown…
Pyrochlore type systems with generic formula (Bi1.5Zn0.5)(Nb0.5M1.5)O7 (M=Ti, Sn, Zr, and Ce) have been synthesized to investigate the influence of M on the dielectric properties. It was found that the incorporation of Sn or Ce resulted in a reasonably reduced dielectric constant. The incorporation of Zr and Ce has le…
Electrical conduction mechanisms and dielectric properties of thermally evaporated N-(p-dimethylaminobenzylidene)-p-nitroaniline thin films, El-Nahass, M M, Zeyada, H M, El-Samanoudy, M M, El-Menyawy, E M
A special mechanism of dislocation nucleation in deformed nanocrystalline materials (NCMs) is suggested and theoretically described. The mechanism represents nonlocal homogeneous nucleation of a nanoscale loop of “noncrystallographic” partial dislocation whose Burgers vector magnitude continuously grows during the nuc…
The effects of different amounts of segregated Ga (substitutional) on an Al grain boundary have been investigated by using a first-principles pseudopotential method. The segregated Ga is found to draw charge from the surrounding Al due to the electronegativity difference between Ga and Al, leading to a charge density…
The effect of ethanol extraction on plasma-polymerized allylamine (PPAA) films was investigated by measuring their thickness change using surface plasmon resonance (SPR) spectroscopy and optical waveguide spectroscopy (OWS). It was found that much of the freshly deposited PPAA films is lost upon ethanol treatment. The…
Nanoparticles of Ni 0.2 Zn 0.6 Cu 0.2 Fe 2 O 4 were prepared by the standard co-precipitation method. The formation of nanocrystalline mixed spinel phase has been confirmed by x-ray diffractograms. The sizes of the nanoparticles were estimated in the range 7–30 nm, which was confirmed by transmission electron microsco…
We report fast, simultaneous charge sensing and transport measurements of gate-defined carbon nanotube quantum dots. Aluminum radio-frequency (rf) single electron transistors capacitively coupled to the nanotube dot provide single-electron charge sensing on microsecond timescales. Simultaneously, rf reflectometry allo…
Arc channels tend to shrink mainly due to the fact that the plasma conductivity naturally increases with its temperature. In this letter, we report a method of generating a large area homogeneous arc plasma at atmospheric pressure. The plasma generator consists of an 80mm diameter graphite anode chamber and an 18mm di…
The existing experimental evidence suggests that exposure of a composite material to an electromagnetic field leads to changes in the material's strength and resistance to delamination. In this work, the mechanical response of transversely isotropic graphite/epoxy composite plates in the presence of an electromagnetic…
A numerical model to study the fatigue crack retardation in a self-healing material (White et al., 2001, Nature, 409, pp. 794–797) is presented. The approach relies on a combination of cohesive modeling for fatigue crack propagation and a contact algorithm to enforce crack closure due to an artificial wedge in the wak…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionStability of the Gyroid Phase in Diblock Copolymers at Strong Segregation. Volume 39, Number 7, March, 14, 2006, pp 2449−2451.Eric W. Cochran, Carlos J. Garcia-Cervera, and Glenn H. FredricksonCite this: Macromolecules 2006,…
The crystal structure of 4-aminopyridinium tetrachlorobismuthate(III), [4-NH 2 PyH ][BiCl 4 ], has been determined at 100 and 260 K by the x-ray diffraction method as monoclinic space group, P 2 1 / c and C 2/ c , respectively. Differential scanning calorimetry and dilatometry reveal one perfectly reversible discontin…
The stability of the trapped electron mode is studied in conditions characteristic of internal transport barriers, namely steep density and temperature gradients. An analytic model allows a unified treatment of all collisionality regimes, from the dissipative limit to the weakly collisional regime (when the velocity s…
The new hydrated cesium borate Cs 2 B 7 O 9 (OH) 5 containing the first example of an isolated heptaborate anion was synthesized by the reaction of H 3 BO 3 with Cs 2 CO 3 at 170 °C. Its crystal structure was determined from single-crystal X-ray diffraction data and further characterized by FT-IR and DTA-TG. It crysta…
We investigate the influence of confinement on phase separation in colloid-polymer mixtures. To describe the particle interactions, the colloid-polymer model of Asakura and Oosawa [J. Chem. Phys. 22, 1255 (1954)] is used. Grand canonical Monte Carlo simulations are then applied to this model confined between two paral…
We have studied the effect of shear on the stability of suspensions made of non-Brownian solid particles. We demonstrate the existence of an irreversible transition where the solid particles aggregate at remarkably low volume fractions (phi approximately 0.1). This shear-induced aggregation is dramatic and exhibits a…
A slab of material with a negative permeability can act as a super-lens for magnetic fields and generate images with a sub-wavelength resolution. We have constructed an effective medium using a metamaterial with negative permeability in the region of 24 MHz, and used this to form images in free space of radio frequenc…
The catalytic properties toward CO combustion of an encapsulated cluster, V@Au12-, have been explored by means of plane-wave pseudopotential density-functional theory calculations. Single adsorption of both O2 and CO as well as coadsorption have been considered. The adsorption energy for the O2 molecule is about 0.3-0…
We fabricated dual-gate ZnO nanorod metal–oxide semiconductor field-effect transistors (MOSFETs) where a Si substrate with a 200 nm thick SiO 2 layer was used as a bottom-gate and a Au electrode with a 100 nm thick SiO 2 layer was used as a top-gate. From current–voltage characteristic curves of the nanorod MOSFETs, t…